public bool IsFileOpen {get;}

This property checks to see if a file is open. It returns true if file is open, or false if the file is closed.

For example:

UniSession us=null;   
				try   
				{
us = 
UniObjects.OpenSession("localhost","xxx","yyy","demo","udcs"); 

UniSequentialFile fl = 
us.CreateSequentialFile("BP",”OLDTEST”,true);    

}     
				catch(Exception e)   
				{    
					Console.WriteLine(e.Message +e.StackTrace);    
				}   
				finally   
				{    
					if(us != null && us.IsActive)    
					{     
						UniObjects.CloseSession(us);          
					}      
				}

This property corresponds to the UniObjects IsOpen method.